sound ideas....you just need something a bit larger that a cigar box....unless your talking about gold, then a cigar box should cover it...My GUESS would be absolutely not. That's why I never buy expensive stuff like Eagles or slabbed/graded coins with numismatic value. For ME it's only about the weight or silver content. In fact lots of silver stacking YouTube guys are heavy into Constitutional or 90%/ Junk silver which is all U.S. coins except nickels and pennies minted before 1965. They are 90% silver. So $1.40 in face value of that equals 1 troy oz of .999 silver. But being fractional means it's easier to barter with or use as real money. Plus it's more recognized and hardly ever counterfeited.
Personally I dig bars from 1 to 10oz . But in the SHTF scenario they wouldn't be nearly as useful. So for most stackers 1oz rounds and 90% silver is where it's at. I have a cigar box dedicated to each.